Target, Wal-Mart and other big retailers have plastered colorful sugar skulls, skeletons and other traditional Day of the Dead symbols on on masks, paper plates and candle holders. There are Day of the Dead earrings and necklaces at Party City, costumes and headbands at Spirit Halloween stores and temporary tattoos and bed covers available at Etsy.com.

Merchandise capitalizing on the Mexican tradition known as Dia de los Muertos had been spreading rapidly in the retail world in recent years, but this year it seems to be everywhere, even stamped on the California Lottery’s “Dia de los Muertos Scratchers.”

Day of the Dead also is the underlying concept of a new Pixar animated movie, “Coco,” that’s being heavily marketed ahead of its Nov. 22 release.

Some point to another movie, 2015’s James Bond film “Spectre,” for helping propel the Day of the Dead momentum because it includes an elaborate Dia de los Muertos parade in Mexico City.

As a result, Day of the Dead — largely celebrated Nov. 1 and 2 — effectively has become rolled up into the Halloween retail juggernaut, unsettling some observers who see it as cultural appropriation that turns the centuries-old Day of the Dead remembrances into crass commercialism.

The melding together of Halloween and Day of the Dead is becoming more apparent.

Nearly 180 million Americans this year are expected to spend a record $9.1 billion on Halloween, a 32 percent surge from just two years ago, according to the National Retail Federation.

The trade group doesn’t yet track Day of the Dead sales alone, but “we wouldn’t be surprised if it becomes mainstream by next year, especially after movies like ‘Coco’ are released,” federation spokeswoman Ana Serafin Smith said. “Movies influence what a lot of people want to dress up as on Halloween.”

Day of the Dead merchandise “has been a popular style” for Party City since it began carrying the products three years ago, said Ryan Vero, president of Party City’s retail division, which operates 900 U.S. outlets. “We even dedicated a section in our stores for this merchandise,” he said.

Day of the Dead products are “dramatically more visible to me this year,” said Charlene Villasenor Black, a professor of Ibero American Art and Chicana-Chicano Studies at UCLA. “The melding together of Halloween and Day of the Dead is becoming more apparent.”

The ever-growing Halloween retail phenomenon is even encroaching on Christmas turf. Some Halloween buffs are buying bright-orange fake Christmas trees and adorning them with skulls, skeletons and candy to create Halloween trees.

The jump in Halloween spending not only is a bright spot for retailers but an offbeat economic indicator because its growth generally has tracked the economy’s expansion and rising consumer confidence.

The National Retail Federation’s spending survey, conducted with Prosper Insights and Analytics, showed that only 12.9 percent of respondents said current economic conditions would affect their Halloween spending this year. That figure was 32.1 percent six years ago, when the economic recovery was stumbling.

Dia de los Muertos goes back thousands of years. Much of the holiday is aimed at celebrating life along with remembering the dead.

The event traditionally consisted of family gatherings that often were held at the gravesites of the departed. Altars, or ofrendas, also were created in survivors’ homes with photos and favorite objects of dead loved ones.

But there’s been a backlash in some quarters.

A recent article on style website Bustle.com listed the Day of the Dead sugar-skull mask or face painting as one of eight costumes that “are actually racist, even if you might not realize it” unless one was raised in Mexican culture and observes Dia de los Muertos.

The website Latina.com listed Dia de los Muertos as one of seven things “Mexicans did before it was cool” and that the holiday “has become fodder for cultural-appropriating Americans.”

Pixar parent Walt Disney Co. also ran into controversy as it developed plans for “Coco.” Disney tried to trademark “Dia de los Muertos” in 2013 but withdrew the application after a public uproar that accused Disney of cultural insensitivity.

Certain universities also are urging students to avoid Halloween costumes in general that some might deem offensive because they reflect ethnic stereotypes or are culturally insensitive and disrespectful.

Villasenor Black said she too was “more conscious of the issue of appropriation” with Day of the Dead merchandise.

“I am wondering about the commercialization” of the tradition at the same time “Latinos and Mexicans are under fire, really, in the United States,” she said, in part because of the heightened national dispute about immigration.

“There’s a tension in my mind,” she said.

It’s not surprising that Day of the Dead merchandise sales would flow into the Halloween retail season because of the calendar, said Tricia Lacy, president of Beistle Co., a century-old Pennsylvania maker of decorations and party goods for retailers.

“There’s no practical way to wait until Halloween” to buy Day of the Dead costumes and other goods “because they’re celebrated one right after the other,” she said. So retailers increasingly include Day of the Dead sections in their Halloween displays.

When Beistle started carrying Day of the Dead products more than a decade ago, it sold only four items. It now has more than 60 Dia de los Muertos products for sale, including masks and paper lanterns, “and we will have more next year,” she said.